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60beb5979b
Simplify param handling in `resolve_bound_vars` I always found the flow of the `ResolvedArg` constructors to be a bit confusing; turns out they're also kinda redundantly passing around their data, too. Also, deduplicate some code handling early-bound var to late-bound var conversion between return type notation's two styles: `where <T as Trait>::method(..): Bound` and `where T: Trait<method(..): Bound>`.
For high-level intro to how type checking works in rustc, see the type checking chapter of the rustc dev guide.